
Proceedings Paper
Mechanism of fluorescent silicon nanoparticlesFormat | Member Price | Non-Member Price |
---|---|---|
$17.00 | $21.00 |
Paper Abstract
Silicon (Si) is known to have an indirect bandgap transition, which means it has poor fluorescence properties. However,
when engineered into sub-nm sized particles, Si nanoparticles become emissive due to quantum confinement. However,
in unmodified Si particles, this effect is limited to generating red or near-infrared emission with low quantum yield. To
resolve these limitations, surface-modification methods have successfully generated Si particles that emit in the blue,
cyan, and green with quantum yields up to ~90%.1,2 These modifications have also made the Si nanoparticles watersoluble,
making them promising in biological applications. To date, the mechanism of emission in these species is still
unclear although it has been speculated that charge transfer of Si-O-N could be responsible. To investigate whether
emission by these Si nanoparticles proceeds via a charge transfer mechanism, Stark spectroscopy is used. In this method,
an external electric field is applied to the Si nanoparticles. Changes in the absorption and/or emission spectra due to the
applied field can be taken as strong evidence for a charge transfer mechanism. From the results of Stark spectroscopy, Si
nanoparticles are revealed to have ligand to metal charge transfer mechanism along with electric-field quenching, which
is useful information for utilization into applications. Addition to the information found, a method of how to tune the
emission maxima based on selection of ligands is prosed.
Paper Details
Date Published: 24 August 2017
PDF: 7 pages
Proc. SPIE 10348, Physical Chemistry of Semiconductor Materials and Interfaces XVI, 103481J (24 August 2017); doi: 10.1117/12.2273432
Published in SPIE Proceedings Vol. 10348:
Physical Chemistry of Semiconductor Materials and Interfaces XVI
Hugo A. Bronstein; Felix Deschler, Editor(s)
PDF: 7 pages
Proc. SPIE 10348, Physical Chemistry of Semiconductor Materials and Interfaces XVI, 103481J (24 August 2017); doi: 10.1117/12.2273432
Show Author Affiliations
Rongchao Jin, Carnegie Mellon Univ. (United States)
Linda Peteanu, Carnegie Mellon Univ. (United States)
Linda Peteanu, Carnegie Mellon Univ. (United States)
Published in SPIE Proceedings Vol. 10348:
Physical Chemistry of Semiconductor Materials and Interfaces XVI
Hugo A. Bronstein; Felix Deschler, Editor(s)
© SPIE. Terms of Use
